US3567631A
Expired / Lapsed
US
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Reverse osmosis membranes from polymeric epoxides
Assignee: Hercules LLC
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Filing: 1969-07-22
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Granted: 1971-03-02
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Expires: 1989-07-22
Abstract
Abstract REVERSE OSMOSIS MEMBRANES CHARACTERIZED BY A SALT REJECTING LAYER OF AN AMORPHOUS POLYMER DERIVED FROM EPIHALOHYDRIN AND AN ALKYLENE OXIDE. THE MEMBRANES ARE USEFUL FOR DESALINATION AND OTHER PROCESSES INVOLVING REVERSE OSMOSIS.
Inventors
- 👤 Carl L Lukach
- 👤 Harold M Spurlin
- 👤 Edwin J Vandenberg
- 👤 William L Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:52
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/52; B01D71/521; B01D71/5211; C; C08; C08G; C08G65/00; C08G65/02; C08G65/04; C08G65/06; C08G65/08; C08G65/22; C08G65/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |